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1771-ir

1771-ir

1771-ir

2） 轉(zhuǎn)換速率(conversion rate)是指完成一次從模擬轉(zhuǎn)換到數(shù)字的ad轉(zhuǎn)換所需的時(shí)間的倒數(shù)。積分型ad的轉(zhuǎn)換時(shí)間是毫秒級(jí)屬低速ad，逐次比 較型ad是微秒級(jí)屬中速ad，全并行/串并行型ad可達(dá)到納秒級(jí)。采樣時(shí)間則是另外一個(gè)概念，是指兩次轉(zhuǎn)換的間隔。為了保證轉(zhuǎn)換的正確完成，采樣速率 (sample rate)必須小于或等于轉(zhuǎn)換速率。因此有人習(xí)慣上將轉(zhuǎn)換速率在數(shù)值上等同于采樣速率也是可以接受的。常用單位是ksps和msps，表 示每秒采樣千/百萬次（kilo / million samples per second）。
 
3）量化誤差 (quantizing error) 由于ad的有限分辯率而引起的誤差，即有限分辯率ad的階梯狀轉(zhuǎn)移特性曲線與無限分辯率ad（理想ad）的轉(zhuǎn)移特 性曲線（直線）之間的最大偏差。通常是1 個(gè)或半個(gè)最小數(shù)字量的模擬變化量，表示為1lsb、1/2lsb。

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